Photography - History of Photography
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The discovery of gun-cotton, in 1846, by Schonbein, was destined to have an important effect on photographic methods, a few years later. Ordinary cotton fibre, treated with "Aqua Regia," a combination of nitric and hydrochloric acids, is so altered in composition as to become soluble. It is interesting to note, in passing, that gun-cotton enters also into the composition of celluloid, the basis of "films."
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